Fox 40 Classic Whistle with Breakaway Lanyard.The Fox 40 Classic Whistle with Breakaway Lanyard was Fox 40's first pea-less whistle, pneumatic air activated, meaning that the harder you blow, the louder the sound. It is reliable, flawless and consistent; producing a penetrating sound that can be heard over that of the ambient noise whether it be the city and the roar of engines, or the ocean and it braking waves. The Fox 40 classic is used by referees and coaches, who need every one of their calls to be heard and depend on its reliability. The whistle needs to be heard above the crowd s cheers and players. The Fox 40 Classic Whistle with Breakaway Lanyard is also the favorite choice for personal safety and rescue professionals. The chambers of the whistle are designed to self-clear if submerged in water and there are no moving parts that may jam, freeze or deteriorate, making the whistle durable and long-lasting. It comes with a breakaway Fox 40 Lanyard that is 3/16 in. rope-style, woven with the Fox 40 brand, and includes a J-hook and button-style spring-loaded adjustable cord lock. This Classic Whistle is great to have as protection, in case of any emergency, sport event, watercraft or outdoor application.